Jaguar cichlid. 90 gallon is a good size for them. The absolute BARE MINIMUM is 75 and it will be very cramped so a 90 would make a pretty good home for them. They grow more than 10" so you will like that. Pretty aggressive too.
Thanks for all the quick responses! I really like the idea of a jaguar cichlid too, are they messy fish? I read somewhere Oscars are quite messy fish. Water clarity is going to be a big deal to me as I'm a bit of a neat freak, do u guys think that with one fish and the x3 another filter will matter?
A ho filter with floss will catch the micro dirt,and they are super easy to clean,i use an fx5 sponge and media,and an aquaclear 110 with floss on my 180gal,water is nice and clear